MAX7418 데이터 시트보기 (PDF) - Maxim Integrated
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MAX7418 Datasheet PDF : 14 Pages
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5th-Order, Lowpass,
Switched-Capacitor Filters
FILTER CHARACTERISTICS
(VDD = +5V for MAX7418–MAX7421, VDD = +3V for MAX7422–MAX7425 filter output measured at OUT, 10kΩ || 50pF load to GND at
OUT, SHDN = VDD, fCLK = 2.2MHz, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
BUTTERWORTH FILTERS—MAX7420/MAX7424
Insertion Gain Relative to
DC Gain
fIN = 0.5fC
fIN = fC
fIN = 3fC
fIN = 5fC
-0.3
0
-3.6
-3.0
-2.4
dB
-47.5 -43
-70
-65
Note 1: The maximum fC is defined as the clock frequency fCLK = 100 x fC at which the peak S / (THD+N) drops to 68dB with a
sinusoidal input at 0.2fC. Maximum fC increases as VIN signal amplitude decreases.
Note 2: DC insertion gain is defined as ∆VOUT / ∆VIN.
Note 3: MAX7418/MAX7421/MAX7422/MAX7425: fOSC (kHz) ≅ 87x103 / COSC (pF).
MAX7419/MAX7420/MAX7423/MAX7424: fOSC (kHz) ≅ 110x103 / COSC (pF).
Note 4: PSRR is the change in output voltage from a VDD of 4.5V and a VDD of 5.5V.
__________________________________________Typical Operating Characteristics
(VDD = +5V for MAX7418–MAX7421, VDD = +3V for MAX7422–MAX7425, fCLK = 2.2MHz, SHDN = VDD, VCOM = VOS = VDD / 2,
TA = +25°C, unless otherwise noted.)
MAX7418/MAX7422
FREQUENCY RESPONSE (ELLIPTIC, r = 1.6)
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
20
40
60
80 100
INPUT FREQUENCY (kHz)
MAX7419/MAX7423
FREQUENCY RESPONSE (BESSEL)
10
0
-10
-20
-30
-40
-50
-60
0
20
40
60
80 100
INPUT FREQUENCY (kHz)
MAX7420/MAX7424
FREQUENCY RESPONSE (BUTTERWORTH)
10
0
-10
-20
-30
-40
-50
-60
-70
-80
0
20
40
60
80 100
INPUT FREQUENCY (kHz)
_______________________________________________________________________________________ 5
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